PoplarV1, Main, Exploration, bibRecord, 000A25

Direct Comparison of Leaf Plasmodesma Structure and Function in Relation to Phloem-Loading Type.

Identifieur interne : 000A25 ( Main/Exploration ); précédent : 000A24; suivant : 000A26

Direct Comparison of Leaf Plasmodesma Structure and Function in Relation to Phloem-Loading Type.

Auteurs : Johannes Liesche [République populaire de Chine] ; Chen Gao [République populaire de Chine] ; Piotr Binczycki [Danemark] ; Signe R. Andersen [Danemark] ; Hanna Rademaker [Danemark] ; Alexander Schulz [Danemark] ; Helle Juel Martens [Danemark]

Source :

Plant physiology [ 1532-2548 ] ; 2019.

RBID : pubmed:30723179

Descripteurs français

KwdFr :
- Aesculus (métabolisme), Aesculus (ultrastructure), Betula (métabolisme), Betula (ultrastructure), Malus (métabolisme), Malus (ultrastructure), Microscopie électronique à transmission (MeSH), Phloème (métabolisme), Plasmodesmes (physiologie), Plasmodesmes (ultrastructure), Sucres (métabolisme), Transport biologique (MeSH).
MESH :
- métabolisme : Aesculus, Betula, Malus, Phloème, Sucres.
- physiologie : Plasmodesmes.
- ultrastructure : Aesculus, Betula, Malus, Microscopie électronique à transmission, Plasmodesmes, Transport biologique.

English descriptors

KwdEn :
- Aesculus (metabolism), Aesculus (ultrastructure), Betula (metabolism), Betula (ultrastructure), Biological Transport (MeSH), Malus (metabolism), Malus (ultrastructure), Microscopy, Electron, Transmission (MeSH), Phloem (metabolism), Plasmodesmata (physiology), Plasmodesmata (ultrastructure), Sugars (metabolism).
MESH :
- chemical , metabolism : Sugars.
- metabolism : Aesculus, Betula, Malus, Phloem.
- physiology : Plasmodesmata.
- ultrastructure : Aesculus, Betula, Malus, Plasmodesmata.
- Biological Transport, Microscopy, Electron, Transmission.

Abstract

The export of photosynthetically produced sugars from leaves depends on plasmodesmatal transport of sugar molecules from mesophyll to phloem. Traditionally, the density of plasmodesmata (PD) along this phloem-loading pathway has been used as a defining feature of different phloem-loading types, with species proposed to have either many or few PD between the phloem and surrounding cells of the leaf. However, quantitative determination of PD density has rarely been performed. Moreover, the structure of PD has not been considered, even though it could impact permeability, and functional data are only available for very few species. Here, a comparison of PD density, structure, and function using data from transmission electron microscopy and live-cell microscopy was conducted for all relevant cell-cell interfaces in leaves of nine species. These species represent the three principal phloem-loading types currently discussed in literature. Results show that relative PD density among the different cell-cell interfaces in one species, but not absolute PD density, is indicative of phloem-loading type. PD density data of single interfaces, even combined with PD diameter and length data, did not correlate with the intercellular diffusion capacity measured by the fluorescence loss in photobleaching method. This means that PD substructure not visible on standard transmission electron micrographs may have a strong influence on permeability. Furthermore, the results support a proposed passive symplasmic loading mechanism in the tree species horse chestnut (Aesculus hippocastanum), white birch (Betula pubescens), orchard apple (Malus domestica), and gray poplar (Populus x canescens) as functional cell coupling and PD structure differed from active symplasmic and apoplasmic phloem-loading species.

DOI: 10.1104/pp.18.01353
PubMed: 30723179
PubMed Central: PMC6446768

Affiliations:

Danemark, République populaire de Chine

Links toward previous steps (curation, corpus...)

to stream Main, to step Corpus: 000A46
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Le document en format XML

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<term>Aesculus (ultrastructure)</term>
<term>Betula (metabolism)</term>
<term>Betula (ultrastructure)</term>
<term>Biological Transport (MeSH)</term>
<term>Malus (metabolism)</term>
<term>Malus (ultrastructure)</term>
<term>Microscopy, Electron, Transmission (MeSH)</term>
<term>Phloem (metabolism)</term>
<term>Plasmodesmata (physiology)</term>
<term>Plasmodesmata (ultrastructure)</term>
<term>Sugars (metabolism)</term>
</keywords>
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<term>Aesculus (ultrastructure)</term>
<term>Betula (métabolisme)</term>
<term>Betula (ultrastructure)</term>
<term>Malus (métabolisme)</term>
<term>Malus (ultrastructure)</term>
<term>Microscopie électronique à transmission (MeSH)</term>
<term>Phloème (métabolisme)</term>
<term>Plasmodesmes (physiologie)</term>
<term>Plasmodesmes (ultrastructure)</term>
<term>Sucres (métabolisme)</term>
<term>Transport biologique (MeSH)</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Sugars</term>
</keywords>
<keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Aesculus</term>
<term>Betula</term>
<term>Malus</term>
<term>Phloem</term>
</keywords>
<keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr"><term>Aesculus</term>
<term>Betula</term>
<term>Malus</term>
<term>Phloème</term>
<term>Sucres</term>
</keywords>
<keywords scheme="MESH" qualifier="physiologie" xml:lang="fr"><term>Plasmodesmes</term>
</keywords>
<keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Plasmodesmata</term>
</keywords>
<keywords scheme="MESH" qualifier="ultrastructure" xml:lang="en"><term>Aesculus</term>
<term>Betula</term>
<term>Malus</term>
<term>Plasmodesmata</term>
</keywords>
<keywords scheme="MESH" xml:lang="en"><term>Biological Transport</term>
<term>Microscopy, Electron, Transmission</term>
</keywords>
<keywords scheme="MESH" qualifier="ultrastructure" xml:lang="fr"><term>Aesculus</term>
<term>Betula</term>
<term>Malus</term>
<term>Microscopie électronique à transmission</term>
<term>Plasmodesmes</term>
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<front><div type="abstract" xml:lang="en">The export of photosynthetically produced sugars from leaves depends on plasmodesmatal transport of sugar molecules from mesophyll to phloem. Traditionally, the density of plasmodesmata (PD) along this phloem-loading pathway has been used as a defining feature of different phloem-loading types, with species proposed to have either many or few PD between the phloem and surrounding cells of the leaf. However, quantitative determination of PD density has rarely been performed. Moreover, the structure of PD has not been considered, even though it could impact permeability, and functional data are only available for very few species. Here, a comparison of PD density, structure, and function using data from transmission electron microscopy and live-cell microscopy was conducted for all relevant cell-cell interfaces in leaves of nine species. These species represent the three principal phloem-loading types currently discussed in literature. Results show that relative PD density among the different cell-cell interfaces in one species, but not absolute PD density, is indicative of phloem-loading type. PD density data of single interfaces, even combined with PD diameter and length data, did not correlate with the intercellular diffusion capacity measured by the fluorescence loss in photobleaching method. This means that PD substructure not visible on standard transmission electron micrographs may have a strong influence on permeability. Furthermore, the results support a proposed passive symplasmic loading mechanism in the tree species horse chestnut (<i>Aesculus hippocastanum</i>
), white birch (<i>Betula pubescens</i>
), orchard apple (<i>Malus domestica</i>
), and gray poplar (<i>Populus x canescens</i>
) as functional cell coupling and PD structure differed from active symplasmic and apoplasmic phloem-loading species.</div>
</front>
</TEI>
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<DateCompleted><Year>2019</Year>
<Month>06</Month>
<Day>18</Day>
</DateCompleted>
<DateRevised><Year>2020</Year>
<Month>02</Month>
<Day>25</Day>
</DateRevised>
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<JournalIssue CitedMedium="Internet"><Volume>179</Volume>
<Issue>4</Issue>
<PubDate><Year>2019</Year>
<Month>04</Month>
</PubDate>
</JournalIssue>
<Title>Plant physiology</Title>
<ISOAbbreviation>Plant Physiol</ISOAbbreviation>
</Journal>
<ArticleTitle>Direct Comparison of Leaf Plasmodesma Structure and Function in Relation to Phloem-Loading Type.</ArticleTitle>
<Pagination><MedlinePgn>1768-1778</MedlinePgn>
</Pagination>
<ELocationID EIdType="doi" ValidYN="Y">10.1104/pp.18.01353</ELocationID>
<Abstract><AbstractText>The export of photosynthetically produced sugars from leaves depends on plasmodesmatal transport of sugar molecules from mesophyll to phloem. Traditionally, the density of plasmodesmata (PD) along this phloem-loading pathway has been used as a defining feature of different phloem-loading types, with species proposed to have either many or few PD between the phloem and surrounding cells of the leaf. However, quantitative determination of PD density has rarely been performed. Moreover, the structure of PD has not been considered, even though it could impact permeability, and functional data are only available for very few species. Here, a comparison of PD density, structure, and function using data from transmission electron microscopy and live-cell microscopy was conducted for all relevant cell-cell interfaces in leaves of nine species. These species represent the three principal phloem-loading types currently discussed in literature. Results show that relative PD density among the different cell-cell interfaces in one species, but not absolute PD density, is indicative of phloem-loading type. PD density data of single interfaces, even combined with PD diameter and length data, did not correlate with the intercellular diffusion capacity measured by the fluorescence loss in photobleaching method. This means that PD substructure not visible on standard transmission electron micrographs may have a strong influence on permeability. Furthermore, the results support a proposed passive symplasmic loading mechanism in the tree species horse chestnut (<i>Aesculus hippocastanum</i>
), white birch (<i>Betula pubescens</i>
), orchard apple (<i>Malus domestica</i>
), and gray poplar (<i>Populus x canescens</i>
) as functional cell coupling and PD structure differed from active symplasmic and apoplasmic phloem-loading species.</AbstractText>
<CopyrightInformation>© 2019 American Society of Plant Biologists. All Rights Reserved.</CopyrightInformation>
</Abstract>
<AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Liesche</LastName>
<ForeName>Johannes</ForeName>
<Initials>J</Initials>
<Identifier Source="ORCID">0000-0001-8753-4037</Identifier>
<AffiliationInfo><Affiliation>College of Life Sciences, Northwest A&F University, Yangling 712100, China.</Affiliation>
</AffiliationInfo>
<AffiliationInfo><Affiliation>Biomass Energy Center for Arid and Semi-arid Lands, Northwest A&F University, Yangling 712100, China.</Affiliation>
</AffiliationInfo>
</Author>
<Author ValidYN="Y"><LastName>Gao</LastName>
<ForeName>Chen</ForeName>
<Initials>C</Initials>
<AffiliationInfo><Affiliation>College of Life Sciences, Northwest A&F University, Yangling 712100, China.</Affiliation>
</AffiliationInfo>
<AffiliationInfo><Affiliation>Biomass Energy Center for Arid and Semi-arid Lands, Northwest A&F University, Yangling 712100, China.</Affiliation>
</AffiliationInfo>
</Author>
<Author ValidYN="Y"><LastName>Binczycki</LastName>
<ForeName>Piotr</ForeName>
<Initials>P</Initials>
<AffiliationInfo><Affiliation>Department of Plant and Environmental Sciences, University of Copenhagen, DK-1871 Frederiksberg, Denmark.</Affiliation>
</AffiliationInfo>
</Author>
<Author ValidYN="Y"><LastName>Andersen</LastName>
<ForeName>Signe R</ForeName>
<Initials>SR</Initials>
<AffiliationInfo><Affiliation>Department of Plant and Environmental Sciences, University of Copenhagen, DK-1871 Frederiksberg, Denmark.</Affiliation>
</AffiliationInfo>
</Author>
<Author ValidYN="Y"><LastName>Rademaker</LastName>
<ForeName>Hanna</ForeName>
<Initials>H</Initials>
<AffiliationInfo><Affiliation>Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark.</Affiliation>
</AffiliationInfo>
</Author>
<Author ValidYN="Y"><LastName>Schulz</LastName>
<ForeName>Alexander</ForeName>
<Initials>A</Initials>
<Identifier Source="ORCID">0000-0001-6796-3598</Identifier>
<AffiliationInfo><Affiliation>Department of Plant and Environmental Sciences, University of Copenhagen, DK-1871 Frederiksberg, Denmark als@plen.ku.dk.</Affiliation>
</AffiliationInfo>
</Author>
<Author ValidYN="Y"><LastName>Martens</LastName>
<ForeName>Helle Juel</ForeName>
<Initials>HJ</Initials>
<Identifier Source="ORCID">0000-0002-3011-4557</Identifier>
<AffiliationInfo><Affiliation>Department of Plant and Environmental Sciences, University of Copenhagen, DK-1871 Frederiksberg, Denmark.</Affiliation>
</AffiliationInfo>
</Author>
</AuthorList>
<Language>eng</Language>
<PublicationTypeList><PublicationType UI="D003160">Comparative Study</PublicationType>
<PublicationType UI="D016428">Journal Article</PublicationType>
<PublicationType UI="D013485">Research Support, Non-U.S. Gov't</PublicationType>
</PublicationTypeList>
<ArticleDate DateType="Electronic"><Year>2019</Year>
<Month>02</Month>
<Day>05</Day>
</ArticleDate>
</Article>
<MedlineJournalInfo><Country>United States</Country>
<MedlineTA>Plant Physiol</MedlineTA>
<NlmUniqueID>0401224</NlmUniqueID>
<ISSNLinking>0032-0889</ISSNLinking>
</MedlineJournalInfo>
<ChemicalList><Chemical><RegistryNumber>0</RegistryNumber>
<NameOfSubstance UI="D000073893">Sugars</NameOfSubstance>
</Chemical>
</ChemicalList>
<CitationSubset>IM</CitationSubset>
<MeshHeadingList><MeshHeading><DescriptorName UI="D031319" MajorTopicYN="N">Aesculus</DescriptorName>
<QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName>
<QualifierName UI="Q000648" MajorTopicYN="N">ultrastructure</QualifierName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D029662" MajorTopicYN="N">Betula</DescriptorName>
<QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName>
<QualifierName UI="Q000648" MajorTopicYN="N">ultrastructure</QualifierName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D001692" MajorTopicYN="N">Biological Transport</DescriptorName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D027845" MajorTopicYN="N">Malus</DescriptorName>
<QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName>
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Direct Comparison of Leaf Plasmodesma Structure and Function in Relation to Phloem-Loading Type.

Direct Comparison of Leaf Plasmodesma Structure and Function in Relation to Phloem-Loading Type.

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